[rules-users] Using Decision Tables as Lookup Tables

[Michael Anstis]

Hmmm... the only way I can see this is possible (i.e. with the use of
accumulate) is to use transient facts:-

*This can be set-up with a decision table quite easily (and ValuedRegion
can be a declarative type that extends Region adding the "value" field)
*
rule "setup ValuedRegions - using a decision table"
    when
        $Region( $score : score )
    then
        insertLogical( new ValuedRegion( $score, [a value] ) );
end

*Your rule
*
rule "Calculate Value"
   when
       $c : Company()
       $r : Region()
       $val : Double() from accumulate (ValuedRegion($score : score, $value
: value ) , sum($score * $value))
   then
       // Do Something
end

On 10 April 2012 14:51, Davout <davout1805 at gmail.com> wrote:

> Hello,
>
> I'm trying to figure out how I can use a Decision Table as a lookup table.
> I
> did come across
> http://drools.46999.n3.nabble.com/Rules-with-Lookup-Tables-td56996.html
> however, it asking about using a database.
>
> Typical Senario:
> Where [value from lookup table] is the value retrieved from the Decision
> Table. The reason I'm looking at a Decision Table rather than using a
> database is because the number of conditions needs to be changeable by end
> users.
>
> rule "Calculate Value"
>    when
>        $c : Company()
>        $r : Region()
>        $val : Double()
>            from accumulate (Region($score : score) , sum($score * [value
> from lookup table]))
>    then
>        // Do Something
> end
>
> Thanks.
>
> --
> View this message in context:
> http://drools.46999.n3.nabble.com/Using-Decision-Tables-as-Lookup-Tables-tp3899689p3899689.html
> Sent from the Drools: User forum mailing list archive at Nabble.com.
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